CVE-2026-66437 in Feedzy Plugin
Summary
by MITRE • 07/27/2026
Contributor Server Side Request Forgery (SSRF) in Feedzy <= 5.2.4 versions.
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Analysis
by VulDB Data Team • 07/27/2026
Server side request forgery vulnerabilities in feedzy versions up to 5.2.4 represent a critical security flaw that allows attackers to manipulate the application's server into making unauthorized requests to internal or external systems. This vulnerability stems from insufficient input validation and sanitization within the feed processing functionality, where user-supplied feed URLs are directly processed without proper authorization checks. The flaw enables malicious actors to exploit the system by crafting specially formatted feed URLs that can trigger requests to internal network resources or external servers controlled by the attacker.
The technical implementation of this vulnerability occurs when feedzy processes RSS or Atom feeds from external sources without adequately validating the input parameters. Attackers can leverage this weakness by providing malicious feed URLs that contain crafted protocols or internal IP addresses, allowing them to bypass normal network security controls and potentially access sensitive internal resources. This type of vulnerability maps directly to CWE-918 which specifically addresses server-side request forgery attacks where applications fail to properly validate user-supplied URLs or URI parameters.
Operational impact of this vulnerability extends beyond simple data exfiltration as it can enable attackers to perform reconnaissance activities against internal network infrastructure, access restricted services, or even escalate privileges within the compromised environment. The vulnerability is particularly dangerous in environments where the feedzy plugin runs with elevated permissions or has access to sensitive internal systems. Attackers could potentially use this flaw to probe internal networks, gather information about running services, or even attempt to exploit other vulnerabilities discovered during network reconnaissance.
The security implications of this SSRF vulnerability align with several techniques documented in the MITRE ATT&CK framework under the T1190 technique for exploitation of remote services and T1071 for application layer protocol usage. Organizations using feedzy versions prior to 5.2.4 should immediately implement mitigations including input validation, URL sanitization, and network segmentation to prevent unauthorized access to internal resources. The recommended approach involves implementing strict validation of feed URLs, blocking access to private IP ranges, and restricting outbound connections from the application server. Additionally, organizations should consider implementing web application firewalls and monitoring for suspicious request patterns that may indicate exploitation attempts.
The vulnerability demonstrates how seemingly innocuous functionality can become a gateway for more serious security breaches when proper input validation is absent. Security teams should conduct comprehensive assessments of all plugins and components that handle external data inputs to identify similar vulnerabilities throughout their WordPress installations. Regular updates and patch management processes are essential to maintain protection against known exploits while implementing defensive measures such as network access controls and monitoring solutions to detect potential exploitation attempts.